TABLE 



Of the apparent distances of Jupiter's satellites from its limb at the 

 time of an eclipse, in | diameters of Jupiter and decimal parts, for every 

 tenth day of Jupiter's distance from opposition or conjunction. Note. 

 Before the oppositions of Jupiter the immersions and emersions happen 

 to the west of Jupiter j after opposition they happen to the east j in an 

 astronomical telescope the appearance will be contrary. 



The difficulty of observing- the immersions, and particularly the emer- 

 sions of Jupiter's satellites, may be attributed to the observer not hav- 

 ing his eye well directed to the spot at which the satellite first issues 

 from the shadow. The discordancies will be materially diminished by 

 the above Table, particularly if a diagram be formed from it, represent- 

 ing 1 the disk of Jupiter at the several times mentioned in the Table, and 

 the proportional distances of the several satellites as there expressed. 



2. Saturn's satellites. 



The 4th satellite of Saturn was discovered by Huy^ens, in 1655 ; and 

 the 1st, 2d, 3d, and 5th by Cassini, within the years 1671 and 1684. Hers- 

 chei discovered two others in 1789 interior to the other five, but which. 

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